| This work investigated the removal capacity of pyrene in soil by mung bean, mung bean-rhizobium association and raw mung bean return. The pot experiments were conducted in 60 days, and the results showed that the removal capacities of pyrene（the range of concentration is 10~100 mg·kg-1） by mung bean with or without rhizobium were 76.8%~89.2% and 85.6%~90.4%，while those in unsterile and sterile soil without mung bean were 35.1%~63.9% and 11.5%~24.6%, respectively. The number of pyrene-degrading microbes positively associated with the concentration of pyrene, but it showed no correlation with mung bean. These results indicated that the removal of pyrene seems to be promoted by mung bean by providing the substrate for symbiotic organisms. Furthermore, during the simulation experiment of raw mung bean return, the removal rate of pyrene increased by 13.84% compared to control in 25 days. This paper finds that mung bean-rhizobium association can effectively remove pyrene in soil, and the application of raw mung bean return can also improve the removal efficiency of pyrene. |
